July 22, 2021 updates Posted on July 22, 2021 by Doug Loss Algorithmic Speedups and Posterior Biases from Orbit Fitting of Directly Imaged Exoplanets in Cartesian Coordinates https://iopscience.iop.org/article/10.3847/2515-5172/ac151d Laplace surface dynamics, revisited: satellites, exo-planets and debris with distant, eccentric companions https://arxiv.org/abs/2107.09682 Limits of Detecting Extraterrestrial Civilizations https://arxiv.org/abs/2107.09794